The use of bind variables in dynamic query created for Ref Cursor
HelloI'm in a situation where there is a Ref cursor to which the query is built execution based on a loop. This is why the number of links would be known until the program runs.
The application is currently using literals instead of bind variables.
code snippet of the above is
strSql: = "select * from emp where 1 = 1 and ().
loop cursor1
If cond is true then
strSql = strSql | "ename = ' |" Cursor1.ColumnName;
end loop;
Open cursor2 for strSql;
How to use links in the example above.
sb92075 wrote:
user13019948 wrote:
HelloHere is the code I have my trying to change literal-based link to the base.
What do you mean by "based bind?
who, what, how determines the values to be 'bound '?
He's referring to the coding style. He is currently using concatenated literal, and the goal is to change it to use the bindings.
If I understand this it is known as method 4 dynamic SQL and requires DBMS_SQL. There are examples autour but they vary according to the type of statement being generated - SELECT statements require column lists to be parsed, unlike the INSERT/UPDATE/DELETE.
This came up recently on my current project and I hit a demo. Here a table of names and values accepted procedure and had to build these in a single WHERE clause along the lines of
AND t_names(i) = t_values(i)
for an undetermined number of elements in the array. For this demonstration, I used a table that we called "attribute" (don't ask) which has columns including 'attribute_id' and 'name', and I need to build a query along the lines of
select description from attribute where attribute_id = :b1 and name = :b2
by the way '1012' and 'ISIN' respectively. (I use a table better and after a CREATE statement for her but I have to rush right now, sorry).
declare
k_sql_base constant varchar2(500) := 'select description from attribute';
t_names constant varchar2_t := varchar2_t('attribute_id', 'name');
t_values constant varchar2_t := varchar2_t('1012', 'ISIN');
l_sql varchar2(500) := k_sql_base;
l_rows_fetched integer := 0;
l_value varchar2(4000);
l_cursor_handle integer;
begin
-- Construct the SQL statement with column names and bind variables e.g.
-- 'select description from mars.attribute where attribute_id = :b1 and name = :b2'
for i in t_names.first .. t_names.last loop
l_sql := l_sql ||
case i
when t_names.first then ' where ' else ' and '
end ||
t_names(i) || ' = :b' || i;
end loop;
dbms_output.put_line('SQL statment = ' || l_sql);
-- Parse the statement we built above (the remaining steps require a parsed cursor):
l_cursor_handle := dbms_sql.open_cursor;
dbms_sql.parse(l_cursor_handle, l_sql, dbms_sql.native);
-- Associate the 1st column of output with variable l_value - required for SELECT statements:
-- (actually the 3rd param here 'column' seems to be only used to get a datatype, in this case we want a string -
-- dbms_sql.column_value actually extracts the value into a specified variable, which can be different.
-- All examples in the documentation pass a local variable without further comment, so not entirely clear what this does other than set the output datatype.)
dbms_sql.define_column(l_cursor_handle, 1, l_value, 4000);
-- Now go through values array binding actual values to :bn variables in the cursor (similar to USING clause of EXECUTE IMMEDIATE)
for i in t_values.first .. t_values.last loop
dbms_sql.bind_variable(l_cursor_handle, ':b'||i, t_values(i));
dbms_output.put_line('Bound :b'||i || ' as ' || t_values(i));
end loop;
-- Open the cursor and fetch the result (no loop here because we are expecting a single-row result):
l_rows_fetched := dbms_sql.execute_and_fetch(l_cursor_handle);
-- 'Returns value of the cursor element for a given position in a cursor'
-- Copy the value of column 1 to variable l_value (has to match
-- dbms_sql.column_value(l_cursor_handle, 1, l_value);
dbms_sql.column_value(l_cursor_handle, 1, l_value);
dbms_output.put_line('Result = ''' || l_value || '''');
dbms_sql.close_cursor(l_cursor_handle);
end;
Hope that helps...
Tags: Database
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Ensure this soft analysis the use of Bind variables
Hi Experts,
I have a request when the query is prepared dynamically in Java code and if I take the query and run it from SQL Navigator, it takes a long time to prepare the statement and then execute it quickly. I think we can use dynamic SQL statements and bind variable to improve performance here. However, I tried to do a PDS to check my understanding. I created 2 procedures
1. mode of operation
2. mode of operationCREATE OR REPLACE PROCEDURE sp_static (id IN NUMBER, name in VARCHAR2) IS TYPE r_curs_type is REF CURSOR; C1 r_curs_type; BEGIN OPEN C1 FOR SELECT * FROM TABLE WHERE columname = id CLOSE C1; END;
To my amazement, there is no difference in the duration of execution of these procedures when I ran the with multiple entries.CREATE PROCEDURE sp_dyanmic (id IN NUMBER, name in VARCHAR2) IS TYPE r_curs_type is REF CURSOR; C1 r_curs_type; BEGIN OPEN C1 FOR 'SELECT * FROM TABLE WHERE columnanme = :U1' USING ID; CLOSE C1; END;
Please note-
1. I have not access to trace files :-(
2. I want to just make sure there will be improved performance before starting the real work, given that some efforts provided by moving the logic of all its activities inside and the use of bind variables.
If you can suggest a strategy to ensure performance gains, it will be extremely useful...
Thanks in advance!
ConcerningHello
(1) it's true, procedure 1 also uses a variable binding
(2) you seem to be confused about the very basic concepts hereDynamic SQL is something like this:
create or replace FUNCTION f (l_table_name VARCHAR2) RETURN NUMBER IS l_result NUMBER; BEGIN EXECUTE IMMEDIATE 'SELECT COUNT(*) FROM ' || l_table_name INTO l_result; return l_result; END;
In this example, since you do not know the name of the table to the execution table, everything you can
is dynamic SQL. As you can see, neither of your two procedures is like that.Dynamic SQL is used when you do not know what columns you want to select, or who
etc. to the execution table. You can also use dynamic SQL statements to force analysis. You can not use
to avoid parsing, binding or not binding.Best regards
Nikolai -
The use of bind variables (in &; out) with sql dynamic
I have a table that contains code snippets to make postings on a set of pl/sql database. what the code does is basically receives an ID and returns a number of errors found.
To run the code, I use dynamic sql with two bind variables.
When codes consists of a simpel query, it works like a charm, for example with this code:
However when I get to post more complexes that must perform calculations or run several queries I run into trouble.BEGIN SELECT COUNT (1) INTO :1 FROM articles atl WHERE ATL.CSE_ID = :2 AND cgp_id IS NULL; END;
I have boiled down the problem into that:
This code is not really make sense, but it's just to show you what is the problem. When I run this code, I get the errorDECLARE counter NUMBER; my_id NUMBER := 61; BEGIN EXECUTE IMMEDIATE (' declare some_var number; begin select 1 into some_var from dual where :2 = 61; :1 := :2; end; ') USING OUT counter, IN my_id; DBMS_OUTPUT.put_line (counter || '-' || my_id); END;
ORA-6537 ON bind variable linked to a position IN
The error doesn't seem wise,: 2 is the only one IN bind variable and it is only used in a where clause clause.
As soon as I remove this where clause, the code works again (giving me 61-61, in case you want to know).
Any idea what goes wrong? I just use bind variables in a way that you're not supposed to use it?
I'm using Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bitCorrection. With immediate execution , the binding is in position, but binds do not need to be repeated. My statement above is incorrect...
You must link only once - but bind by position. And the connection must correspond to the use of the variable binding.
If the connection never variable assigns a value in the code, link by in.
If the binding variable assigns a value in the code, link as OUTPUT.
If the binding variable assigns a value and is used a variable in another statement in the code, link as IN OUT.
For example
SQL> create or replace procedure FooProc is 2 cnt number; 3 id number := 61; 4 begin 5 execute immediate 6 'declare 7 n number; 8 begin 9 select 10 1 into n 11 from dual 12 where :var1 = 61; --// var1 is used as IN 13 14 :var2 := n * :var1; --// var2 is used as OUT and var1 as IN 15 :var2 := -1 * :var2; --// var2 is used as OUT and IN 16 end; 17 ' 18 using 19 in out id, in out cnt; --// must reflect usage above 20 21 DBMS_OUTPUT.put_line ( 'cnt='||cnt || ' id=' || id); 22 end; 23 / Procedure created. SQL> SQL> exec FooProc cnt=-61 id=61 PL/SQL procedure successfully completed. SQL>
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The use of bind variables in the application process
Bind variables refer to elements of session state supported in queries in an application request process?
All the examples I see show how to pass client side values using the $v () function and the htmldb_get object addParam method and refer to them using the wwv_flow.g_xNN variables, but already available in session state values, I should be able to use them directly in the process, right?
Thank youYes, they are supported.
Denes Kubicek
-------------------------------------------------------------------
http://deneskubicek.blogspot.com/
http://www.Opal-consulting.de/training
http://Apex.Oracle.com/pls/OTN/f?p=31517:1
http://www.Amazon.de/Oracle-Apex-XE-Praxis/DP/3826655494
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create or replace function wsdltest return xmltype as
l_dummy xmltype.
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CLOB l_xml;
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< xsd: element name = "F1Output" >
< xsd: complexType >
< xsd: SEQUENCE >
< xsd: element name = "RETURN" type = "xsd: String" / >
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< / xsd: complexType >
< / xsd: element >
< / xsd: Schema >
< / types >
< name of message = "F1InputMessage" >
< name of part = "parameters" element = "tns:SVARCHAR2 - F1Input" / >
< / message >
< name of message = "F1OutputMessage" >
< name of part = "parameters" element = "tns:F1Output" / >
< / message >
< portType name = "F1PortType" >
< operation name = "F1" >
< input message = "tns:F1InputMessage" / >
< output message = "tns:F1OutputMessage" / >
< / operation >
< / portType >
< connection name = "F1Binding" type = "tns:F1PortType" >
< style: binding soap = transport "document" = "http://schemas.xmlsoap.org/soap/http" / >
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< / Entry >
< output >
< soap body parts: = 'settings' use = "literal" / >
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< / operation >
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< service name = "F1Service" >
< documentation > Oracle Web Service < / documentation >
< name of port = "F1Port" binding = "tns:F1Binding" >
< soap: address location = "http://localhost: 8080/orawsv/XFILES/F1" / >
< / port >
< / service >
< / definitions > ';
-OK
l_stt: = ' select * from xmltable (XMLNAMESPACES ("http://www.w3.org/2001/XMLSchema" AS "XSD", default "http://schemas.xmlsoap.org/wsdl/"),)
[' / / definitions/types/XSD:schema/XSD:element[@name="SVARCHAR2-F1Input ']"
by the way xmltype(:1)
columns
path of xmltype AB ".") you;
--
EXECUTE IMMEDIATE l_stt INTO l_dummy using l_xml;
-ERROR ORA-01006
L_Name: = ' 'SVARCHAR2-F1Input "";
l_stt: = ' select * from xmltable (XMLNAMESPACES ("http://www.w3.org/2001/XMLSchema" AS "XSD", default "http://schemas.xmlsoap.org/wsdl/"),)
[/ / definitions/types/XSD:schema/XSD:element[@name=:2] "
by the way xmltype(:1)
columns
path of xmltype AB ".") you;
--
EXECUTE IMMEDIATE l_stt INTO l_dummy using l_xml, l_name;
Return l_dummy;
END;
Any idea?
Thanks in advance
CyrylYou can try something like
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Oracle Web Service -
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IgorIgorKSCon wrote:
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18___4___30___0___0
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John
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the CBC
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How can I do without change using my article.
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Something like this maybe:
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< nl >
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Use of bind variables in the repository
All,
Our client has a requirement that they need the sales this year of sales vs. last year passing year as a guest.
I can't use BI built in function to get early start or this year last year because our calendar dates are not standard. So I have to this day of dim query table to see e.g. for whats 2010 is the start date and so on...
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Kind regards
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Hi all
I'm a casual user of the DB and right now need to update the records about 1000 + so that a certain column gets a unique value.
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Then, I built this type of SQL statement for only a small subset of records:
----------
variable number recNumber;
exec: recNumber: = 1;
UPDATE TABLE_TO_BE_UPD
SET COL_TO_BE_UPD = COL_TO_BE_UPD + recNumber
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----------
I get invalid SQL statement error when you try to run above (except for the guest who asks for a value I want to omit).
In any case, I also tried this one:
----------
CREATE SEQUENCE seqCounter;
UPDATE TABLE_TO_BE_UPD
SET COL_TO_BE_UPD = COL_TO_BE_UPD + seqCounter.NEXTVAL
WHERE COL_TO_BE_UPD IN ('VAL_A', 'VAL_B');
----------
Of it, I got the error ORA-01722: invalid number... I guess it's because seqCounter is of type number and the COL_TO_BE_UPD is of type character... (?)
Then I want to ask is what is the correct way to define and use a counter variable type to add a number at the end of a string?
Also another question I would ask is that are variables that are used in queries ad hoc, also called "bind variables"?
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Thank you!http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:227413938857
Identifiers cannot be used as variable bind - never. Identifiers must be "hard-coded".
in the query.I can't put in a link for "emp" variable because I can't use a string
constant for emp.The reason is quite simple - a bind variable query is parsed and optimized once
variables are evaluated before linking. If I could code:Select * from: bind_x
the optimzer would not have an idea of what will come with, security (access rights)
could be evaluated and so on. We could not develop a plan for this query - not
enough information. Therefore, no variable bind for identifiers. -
Use of Bind Variable in LOV Jdev 11.1.2
Hello:
I have a lookup_codes table that has values for different columns used in multiple LOV. I created the object based on reading view single SQL statement for the table with a variable binding. Based on the column where I want to set the LOV, I would like to change the variable binding, so the LOV shows that codes of research for this particular column. Essentially, I want to change the binding variable during execution. How can I accomplish this?
Thanks for the help.
Published by: 862658 on July 28, 2011 10:51Hello
You can use the VO API and call vo.setWhereClauseParams ();
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Brano -
trace of the user with bind variables
Hi all
10.2.0.4 on solaris 10
Followed a user session, once the connection to the database, using the below
I understand that the level 4 will be the value of the variables bind inside... but isn't the generated trace filecreate or replace trigger login_trigger after logon on database begin if (USER in ('MED','MEDT')) then execute immediate 'ALTER SESSION SET EVENTS ''10046 TRACE NAME CONTEXT FOREVER, LEVEL 4'''; end if; end; /
the value of the variable bind as you can see below
Am I missing something?PARSE ERROR #7:len=261 dep=0 uid=196 oct=3 lid=196 tim=12004802132819 err=907 select :"SYS_B_0" from ORM_RESTRICTED_CAT_BAL_ORD where (((CONTRACT_CAT=:b0 and ORDER_NO=:b1) and PREPOST_PAID in (:b2:b3,:"SYS_B_1")) and ((TRUNC(SYSDATE)>= TRUNC(FROM_DATE) and TO_DATE is null ) or TRUNC(SYSDATE) between TRUNC(FROM_DATE) and TRUNC(TO_DATE)))
KaiS wrote:
=====================
PARSE ERROR #7:len = 261 dep = 0 = 95 oct cover 3 = uid = 95 tim = 12005421332712 err = 907
Select: 'SYS_B_0' from ORM_RESTRICTED_CAT_BAL_ORD where (((CONTRACT_CAT =: b0 et ORDER_NO =: b1) and PREPOST_PAID in (: b2:b3,: 'SYS_B_1')) and ((TRUNC (SYSDATE) > =)))
TRUNC (from_date) and TO_DATE is null) or trunc (sysdate) between TRUNC (FROM_DATE) and TRUNC (TO_DATE)))Looks like you got a parse error. You got yet to the phase of binding of variables again so I don't expect to see in the trace file.
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If I try to access to "the effective use of the bind variables, cursor_sharing and parameters related cursor" doc with link http://www.oracle.com/technetwork/database/features/performance/whitepapers-098560.html http://www.oracle.com/technology/deploy/performance/pdf/cursor.pdf I get
>
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